A couple of lines on my rear window defogger are broken. I want to repair them using a defogger repair kit. But I can't seem to find one. I've checked at Montgomery road but the people there have never heard of it. They say that defogger lines cannot be repaired. Conductive silver paint will also do the trick but no such paint is available at the paint shops that I checked.
This is an example of what I am looking for:

Permatex® Quick Grid™ Rear Window Defogger Repair Kit
Provides a low-cost, high-quality repair for damaged rear window defogger grids. Complete kit for a superior repair. Quick Grid™ is the result of a joint research project with the General Motors Research Center.
Suggested Applications:
Rear window defoggers
Anyone know where I can buy the kit or the conductive paint?
Thanks